APTonCD aims to solve this problem by backing up all your packages into a Cd/DVD. You can then install your applications right from the CD/DVD. If you want to save up on CD, you can even store the data as an iso file and restore your system right from the ISO file. Here’s how it is done: Install APTonCD you can also install it via the Synaptic Package Manager. Go to “System -> Adminstration -> APTonCD”
Backing up package
Click the Create button. APTonCD will then scan your system for all the package that you have downloaded/installed previously. When it is done scanning, you can then select the package that you want to backup. Click Burn to start the backup process. Enter the destination to store the image. Depending on the size of the file, you might need to choose DVD instead of CD. When it is done, it will prompt you to burn into a CD/DVD. Click Cancel if you only want to store it as an ISO file. This is all you need to do for the backing up process.
Restoring the package
To restore the package (assuming you have created the CD media), simply pop in the CD/DVD. Your computer will scan the disc and prompt up a window asking if you want to restore the package. Click Yes. Once that’s done, you will be able to install applications from the Synaptic Package Manager (or apt-get) without Internet connection.